Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
70.2
80
77
78
72
53
February
86.0
97
92
98
83
96
March
94.6
96
98
99
98
95
April
96.6
95
95
99
100
May
97.5
97
100
99
99
June
97.6
99
99
100
94
July
99.0
100
100
99
98
August
98.2
99
96
97
98
September
97.2
100
94
98
99
October
94.7
99
83
97
88
November
83.2
95
72
87
61
December
76.1
87
85
64
78
Average
92.3
91.8
95.7
93.1
93.1
90.4
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.